/*
 * Copyright 2023 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty5.util.concurrent;

import java.util.concurrent.TimeUnit;

import static java.util.Objects.requireNonNull;

enum SystemTicker implements Ticker {

    INSTANCE;

    static final long START_TIME = System.nanoTime();

    @Override
    public long initialNanoTime() {
        return START_TIME;
    }

    @Override
    public long nanoTime() {
        return System.nanoTime() - START_TIME;
    }

    @Override
    public void sleep(long delay, TimeUnit unit) throws InterruptedException {
        requireNonNull(unit, "unit");
        unit.sleep(delay);
    }
}
